The first slice of pizza yields Jeffrey 4242 units of utility and the second slice yields him an additional 2828 units of utility. His total utility from three slices of pizza is 9090 units of utility. The marginal utility of the third slice of pizza:

20

Explanation:

The computation of the marginal utility of the third slice is shown below:

= Total utility from three slices of pizza - second yield an additional units of utility - first slice of pizza units of utility

= 90 units - 28 units - 42 units

= 90 units - 70 units

= 20

The amount are mistakenly repeated in the question

Basically we deduct the first and second utility from the total utility

answer; (b) insider trading;

i would say iii (3) because in order to compare a price you have to use as a reference other near stores because it's its

hope i explained myself